import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';

class Square extends React.Component {

  render() {
    //console.log('rendering in Square..')
    return (
      //<button className="square" onClick={this.handleMyClick(this.props.value1)}>
      //<button className="square" onClick={() => {this.state = {value : 'X'}}}>
      <button className={'board square' + this.props.value} onClick={() => { this.props.onClick() }}>
        {this.props.value}
      </button>
    );
  }
}

class Board extends React.Component {

  renderSquare(i) {
    console.log('renderSquare-' + this.props.squares[i])
    return <Square value={this.props.squares[i]} onClick={() => this.props.onClick(i)} />;
  }

  render() {
    console.log('rendering in Board..')

    return (
      <div>

        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

class Game extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      history: [{
        squares: Array(9).fill(null),
      }],
      xIsNext: true,
      stepNumber: 0,
    };
  }

  handleMyClick(i) {
    console.log('handling click..')

    const history = this.state.history.slice(0, this.state.stepNumber + 1);
    const oldSquares = history[history.length - 1].squares;
    if (oldSquares[i]) {
      console.log('Done')
      return;
    }
    console.log('oldSquares - ' + oldSquares);
    const newSquares = oldSquares.slice();
    newSquares[i] = (this.state.xIsNext ? 'X' : 'O');
    console.log(newSquares);
    this.setState({ history: this.state.history.concat([{ squares: newSquares }]), xIsNext: !this.state.xIsNext, stepNumber: history.length });
    //this.setState({ squares: squares, xIsNext: !this.state.xIsNext});
  }

  jumpTo(step) {
    this.setState({
      stepNumber: step,
      xIsNext: (step % 2) === 0,
    });
  }

  render() {
    console.log('rendering in Game..')
    console.log(this.state.history.length);
    console.log(this.state.history[this.state.history.length - 1]);
    const current = this.state.history[this.state.stepNumber].squares;
    console.log('current-' + current);
    const winner = calculateWinner(current);
    let status = '';
    if (winner) {
      status = 'Winner is ' + winner;
    } else {
      status = 'Next player is ' + (this.state.xIsNext ? 'X' : 'O');
    }
    const moves = this.state.history.map((step, move) => {
      const desc = move ?
        'Go to move #' + move :
        'Go to game start';
      return (
        <li key={move}>
          <button onClick={() => this.jumpTo(move)}>{desc}</button>
        </li>
      );
    });

    return (
      <div className="game">
        <div className="game-info">
          <div>{status}</div>
          <div className="game-board">
            <Board squares={current} onClick={(i) => this.handleMyClick(i)} />
          </div>
          <div><ol>{moves}</ol></div>

        </div>


      </div>
    );
  }
}

// ========================================

ReactDOM.render(
  <Game />,
  document.getElementById('root')
);

function calculateWinner(squares) {
  const lines = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6],
  ];
  for (let i = 0; i < lines.length; i++) {
    const [a, b, c] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}
